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It is aimed at locksmith practitioners but has a cogent discussion of principles as well as technique. Another tutorial reference is The National Locksmith Guide to Picking and Impressioning by Robert Sieveking. Any physical security assessment should consider defenses against the full range of potential threats, not just vulnerability to lock picking. Pin-tumbler lock picking has long been among the common skills of the security community. Some pin tumbler locks incorporate "high security" features, including secondary locking mechanisms and features intended specifically to frustrate picking. This keyway is common in commercial and residential locks in the US, and is close in shape and size to a number of other common keyways, including that used by Kwikset, a very popular (and easily defeated) line of US residential locks. And close your eyes. The book is an encyclopedic guide to mechanical locks, how to evaluate them, and how to defeat them, aimed primarily at investigators, law enforcement and intelligence operatives. The first step toward learning to defeat locks is a thorough understanding of how they work, where their security comes from, and how their design and manufacture introduces potentially exploitable vulnerabilities. The pick design it calls a "rake" is called a "hook" by the rest of the world (it's the kind of pick you'll be using most).

Well, now, you see, you’ve got to realize that we think of the world largely in terms of Newtonian mechanics. And the real world is not an idea, it is not words. When you hold a cylinder in your hand you get different feedback from the pins than you do on a real door. And then we’ll come back to the real business of this gathering within that time. The modern pin tumbler lock is quite simple, dating back to ancient Egypt but not commercially mass-produced until the middle of the 19th century. From the attacker's perspective, too, lock picking is rarely the most efficient, most economical, fastest, or easiest method of entry. Criminals generally prefer either procuring a key or forced entry for speed, certainty, and stealth, notwithstanding whatever property damage or evidence is left behind. Few burglars can afford to risk exposure during the time required to pick even relatively easy locks, and unexplained possession of lock picking tools is often considered prima facia evidence of criminal intent. Reset the lock by returning the plug to the vertical locked position and try again but with torque applied in the other direction.

In the locked state the plug is prevented from rotating by a set of movable pin stacks, typically under spring pressure, that protrude from holes in the top of the opening in the shell into corresponding holes drilled into the top of the plug. The serrated section tends to false set and jam as long as torque is applied. Now release torque and start over, taking care to pick all the pin stacks with spool/mushroom pins while leaving at least one regular pin stack unset (this will require a light touch and good sensitivity). Note that excessive raking with any of these techniques will tend to overset pins, so be prepared to release torque and start over from time to time. For example, the method it calls "scrubbing" is called "raking" by almost everyone else (it's not something I suggest you spend much time on, at least at first, by the way).

As with pin tumbler locks, because the levers, gates, and fence are slightly out of alignment, it is usually possible to raise and pick the levers one at time. Repeat this exercise until you can reliably distinguish between a binding and a non-binding pin with very little lifting. See Figures 3 and 4. Once you're comfortable with the AR1 keyway, move on to the "Ilco SX" keyway locks and repeat the exercise. It can become very tempting to "cheat" a bit here and move ahead the moment you get a difficult lock open the first time, but that will only make the rest of the course that much harder. There has been quite a bit written, on the Internet and in print, about lock picking. There is a more detailed discussion of configuring training locks at the end of this document. Although somewhat romanticized by popular media and culture, in reality the significance of lock picking is usually dwarfed by other, more practical threats. While pin-at-a-time picking is usually the most reliable way to open a given lock (and the skills used essential for mastery of other techniques), raking can sometimes open a lock more quickly. You should be able to confidently find each pin and push it all the way up, without jamming the pick against anything or moving other pins.

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